\documentclass[a4paper,11pt,notitlepage]{article}
%\usepackage{fourier}
\setlength{\unitlength}{2em} % for the picture environment

\setlength{\parindent}{0pt}
\setlength{\parskip}{2ex}
\addtolength{\topmargin}{-1cm}
\addtolength{\textheight}{2cm}
\addtolength{\evensidemargin}{-1cm}
\addtolength{\oddsidemargin}{-1cm}
\addtolength{\textwidth}{2cm}
% 4 levels of headings
\newcommand{\headA}[1]{{\huge \vspace{1ex} \bf \hfill #1 \vspace{1ex}\hfill}}
\newcommand{\headB}[1]{{\Large \vspace{1ex} \bf #1 \vspace{1ex} }}
\newcommand{\headC}[1]{{\large \vspace{1ex} \bf #1 \vspace{1ex} }}
\newcommand{\headD}[1]{{\bf \vspace{1ex} #1 \vspace{1ex} }}

\newcommand{\pushin}{\hspace*{1em}}


\begin{document}
\title{Prueba de generaci\'on de diagramas con Flow}
\author{Tabar\'e P\'erez}
\date{Hoy}
%\maketitle

\begin{center}
\Huge{Prueba}
%\input{comm01.pic}
\end{center}

\end{document}
